In Lexer::getCharAndSizeSlow[NoWarn] make sure we don't go over the end of the buffer

when the end of the buffer is immediately after an escaped newline.

Fixes http://llvm.org/PR10153.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@147091 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 7 insertions, 0 deletions

diff --git a/lib/Lex/Lexer.cpp b/lib/Lex/Lexer.cpp
index 25e320df51..acb5b8a797 100644
--- a/lib/Lex/Lexer.cpp
+++ b/lib/Lex/Lexer.cpp
@@ -1171,6 +1171,10 @@ Slash:
       // Found backslash<whitespace><newline>.  Parse the char after it.
       Size += EscapedNewLineSize;
       Ptr  += EscapedNewLineSize;
+
+      if (Ptr[0] == '\0')
+        return '\\';
+
       // Use slow version to accumulate a correct size field.
       return getCharAndSizeSlow(Ptr, Size, Tok);
     }
@@ -1222,6 +1226,9 @@ Slash:
       Size += EscapedNewLineSize;
       Ptr  += EscapedNewLineSize;
 
+      if (Ptr[0] == '\0')
+        return '\\';
+
       // Use slow version to accumulate a correct size field.
       return getCharAndSizeSlowNoWarn(Ptr, Size, Features);
     }